Complete How-To-Build video: https://youtu.be/doCg0k0m-dA
Description:
This project came about because I wanted to have a cordless fume extractor. The extractor can be powered from either a 12VDC wall adaptor Or 3x 18650 lithium batteries making it rather unique. To prevent the batteries from being over-discharged & to prevent both power sources from competing to drive the fan, a low volt disconnect I build in another video is used. You can learn more about the Low-Volt-Disconnect here.
If both power sources are present, by default the fan will run from the batteries. In an ideal world, I'd prefer the power adaptor to be the default power source. But hey, in reality, I'm only going to use the pwr adaptor as a back up if the batteries run flat.
Selecting a high-performance 140mm fan is very important. The fan I used can be found below under components. However, you could select any other fan with similar performance figures.
For comparison, these are the specs of the Noctua fan I used:
Airflow: 158.5 CFM
Static pressure: 10.52 mmH20
How effective is the filtration? That’s a good question. I don’t have specialized equipment to measure the air quality, however, I’m certain it doesn’t filter everything since I can visibly see some smoke exhaust out the back of the extractor.
So does that mean it’s useless? Well not in my opinion. In my workshop, all I had to do was prevent the smoke from concentrating around my immediate work area. And this fume extractor does just that, it sucks away the concentrated smoke and blows it away from my work area.
The housing for this project is entirely 3D printed. And the 3D files can be found here: https://www.thingiverse.com/thing:4597398
3D Print one of each except for the enclosure files. You only need to print a single enclosure and you must choose one that suits your power switch size, there are 16mm, 19mm & 22mm variants and there is also the option to print an enclosure that doesn't have any switch or DC power jack holes. This way you can print the enclosure and dill/cut holes to suit your hardware.
If you purchase any products using the affiliate links below, you are helping support my content and that makes you awesome! 😎
Components:
Noctua Industrial 140mm Fan, 3000rpm: https://amzn.to/3mv9R0r
Carbon filter sheet (cut down to 138x138mm): https://amzn.to/2Flp837
3S 18650 battery compartment: https://ebay.to/3hxUXCA
16mm DPST On/Off switch: https://ebay.to/3kjVhHa
5.5x2.5mm DC power jack, female, panel mount: https://ebay.to/3c13ywC
SB540 Schottky diode: https://ebay.to/3mwWvke
Low volt disconnect: https://www.schematix.co.nz/forum/how-to-s/low-volt-disconnect-project
Optional: 12VDC, 1A wall adaptor: https://amzn.to/3c1maN1
Hardware:
8x 4g 12mm countersunk, self-tapping screw (used to assemble the enclosure)
4x M4x40mm countersunk, screw (used to mount fan)
4x M4 nyloc nuts (used to mount fan)
4x 4g x 6mm pan head screws (Mount LVD to enclosure)
4x PC fan screw (secures the battery compartment to enclosure cover)
Wiring Diagram:
Thanks for this great design and very complete building description! My version is only using external power (for now); still looking for the correct battery compartment. But already very useful. Printed in two-color (ran out of gray filament, but the result was surprisingly nice).
Hi, thanks for this great guide!
Could you please tell me where the SB540 Schottky diode is connected as I don't see it in the wiring diagram?
Hi,
I've just printed the parts for this build, with the no holes enclosure. Having it battery-powered is not so important for me, but I recently also built your TS80P power supply. Do you think I could modify the TS80P power supply to also run this extractor fan? It would be good to minimise the number of wall warts required.
The new switch arrived yesterday, so I'd like to build another one of your Extractors, with this one being dual powered. The battery powered one in the picture works great, btw! The Noctua fan you recommended is extremely powerful (and not nearly as loud as you'd expect for the power.) I would like your assistance with wiring the second Extractor, as I'm not sure how to wire everything through the Low-volt Disconnect module (I built from your project.) If you can give me more specific instructions, it would be greatly appreciated. Thank you for all of your help!
Here is the one I built using the original 5-pin switch I had. I wired it up to run off of 3x18650 batteries. I received the DPDT switch you found for me, and I can use some help wiring everything thru the Low-volt Disconnect module I built from your project. I'd like to have it run off both the power brick and batteries, rather than just the batteries. Thanks for all your time and assistance!
I'm extremely new to electronics. I assembled his Low-voltage Disconnect project, and this is really the first project where wiring is concerned (especially involving dual power sources). Can anyone help with the wiring? The diagram doesn't help me. Any help would be greatly appreciated! BTW, I have all Extractor pieces printed and assembled. It's just how to wire the 5-prong switch/DC input jack and LVD that I'm a bit confused with.
with 3 D printer do you use for this?